Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Boca Raton, Flórida teve qual quantidade se juntou?
 ###Tabelas: CREATE TABLE current_members (current_members_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Founded INT, Type VARCHAR, Enrollment INT, Nickname VARCHAR, Joined INT) CREATE TABLE colles (colles_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Latitude VARCHAR, Longitude VARCHAR, Diameter (km) INT, Year named INT) CREATE TABLE current_fleet_roster (current_fleet_roster_id AUTO_INCREMENT PRIMARY KEY, Builder VARCHAR, Model VARCHAR, Length (ft/m) VARCHAR, Order Year VARCHAR, Fuel Propulsion VARCHAR, Fleet Series (Quantity) VARCHAR) CREATE TABLE chinese_taipei_women's_national_football_team (chinese_taipei_women's_national_football_team_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Venue VARCHAR, Score VARCHAR, Competition VARCHAR, Report VARCHAR) CREATE TABLE constituents (constituents_id AUTO_INCREMENT PRIMARY KEY, Date INT, 2 January 2007 VARCHAR, 19 October 2009 VARCHAR, 5 November 2010 VARCHAR, 16 December 2011 VARCHAR, 30 March 2012 VARCHAR)  
SELECT Joined FROM current_members WHERE Location = Boca Raton, Florida